Android Home And Lock Screen Widget - (Temperature Widget)

Create TemperatureWidget class and register with Temperature sensor intend
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package com.javaorigin.widget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.widget.RemoteViews;

package com.javaorigin.widget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.widget.RemoteViews;

public class TemperatureWidget extends AppWidgetProvider {
 double temp=0;
 @Override
 
 public void onUpdate(Context context, AppWidgetManager appWidgetManager,
   int[] appWidgetIds) {
  context.getApplicationContext().registerReceiver(this,new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
  updateUI(context) ;
 }

 @Override
 public void onReceive(Context context, Intent intent) {  
  temp=intent.getIntExtra("temperature", 0)/10.0D;
  updateUI(context) ;
  super.onReceive(context, intent);
 }

 private void updateUI(Context context) {
  RemoteViews thisViews = new RemoteViews(context.getApplicationContext() .getPackageName(), R.layout.widget_layout);
  thisViews.setTextViewText(R.id.update, temp + "");

  ComponentName thisWidget = new ComponentName(context,TemperatureWidget.class);
  AppWidgetManager.getInstance(context).updateAppWidget(thisWidget,thisViews);
 }
}

Create widget_layout.xml under res/layout folder

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="8dip"
    android:background="@drawable/myshape" >

    <TextView
        android:id="@+id/update"
        style="@android:style/TextAppearance.Medium"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="center_horizontal|center_vertical"
        android:layout_margin="4dip"
        android:text="Static Text" >
    </TextView>

</LinearLayout> 

Create myshape.xml under res/drawable folder

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <stroke
        android:width="2dp"
        android:color="#FFFFFFFF" />

    <gradient
        android:angle="225"
        android:endColor="#DD2ECCFA"
        android:startColor="#DD000000" />

    <corners
        android:bottomLeftRadius="7dp"
        android:bottomRightRadius="7dp"
        android:topLeftRadius="7dp"
        android:topRightRadius="7dp" />

</shape>

Create widget_info.xml under res/xml folder ,We can create this xml file using " File-->New --> Android xml file " menu with resource type is AppWidget Provider option ,then set attribute android:widgetCategory="keyguard|home_screen"

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"  
    android:initialLayout="@layout/widget_layout"
    android:minHeight="20dp"
    android:minWidth="20dp"
    android:updatePeriodMillis="30000" android:widgetCategory="keyguard|home_screen">  
    

</appwidget-provider>

Configure android manifest xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.javaorigin.widget"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
           <receiver android:name="TemperatureWidget" >
            <intent-filter >
                <action 
                    android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/widget_info" />
        </receiver>
    </application>

</manifest>